Repeated failed forced regens - limp mode

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Sheffy
Posts: 7
Joined: 26 Nov 2021, 10:31

Repeated failed forced regens - limp mode

Post by Sheffy » 26 Nov 2021, 10:38

Hi,

I have a doblo 223 1.9 multijet. It is is limp mode and I'm trying to regen the DPF but it fails and says Injected quantities out of permitted range".

What does this mean?

I've got no EML on, only code is glow plug relayed (P0683) but I'm still stuck in limp mode.

Anyone have an idea?

shpuncik
Posts: 306
Joined: 19 Oct 2018, 16:43

Re: Repeated failed forced regens - limp mode

Post by shpuncik » 26 Nov 2021, 12:29

usually glow plugs system should be working without errors to be able to run DPF regeneration

Sheffy
Posts: 7
Joined: 26 Nov 2021, 10:31

Re: Repeated failed forced regens - limp mode

Post by Sheffy » 27 Nov 2021, 00:37

shpuncik wrote:
26 Nov 2021, 12:29
usually glow plugs system should be working without errors to be able to run DPF regeneration
So you think the glow plug fault could be contributing to failed forced regens? I'll replace the set if so.

abarthmultijet
Posts: 116
Joined: 17 Feb 2021, 22:37
Location: Oss, Netherlands

Re: Repeated failed forced regens - limp mode

Post by abarthmultijet » 28 Nov 2021, 11:06

Yes, you should certainly replace the glow plugs first! They are not expensive and easy to replace (with a bit of experience). Make sure they are the right voltage.
Abarth Punto Evo, Fiat Doblo 263 1.4 t-jet, Audi S4 B8.5, 1.3 Multijet specialist, Uconnect 7 specialist,

Sheffy
Posts: 7
Joined: 26 Nov 2021, 10:31

Re: Repeated failed forced regens - limp mode

Post by Sheffy » 29 Nov 2021, 11:17

abarthmultijet wrote:
28 Nov 2021, 11:06
Yes, you should certainly replace the glow plugs first! They are not expensive and easy to replace (with a bit of experience). Make sure they are the right voltage.
Thank you. I've ordered a set and will update once I've fitted and tried to regen again.

s130
Posts: 941
Joined: 20 Jan 2010, 10:07
Location: Wrexham, North Wales

Re: Repeated failed forced regens - limp mode

Post by s130 » 29 Nov 2021, 14:27

While you are waiting for the plugs to arrive soak the old ones around the base/thread area with penetrating fluid. Go gently when removing as too much force will sheer the tops off! If tight then try a fixed wrench and repeatedly tap / shock / jiggle.
Fiat Strada/Ritmo Abarth 130TC, Barchetta 2005 , 500X Cross Plus

abarthmultijet
Posts: 116
Joined: 17 Feb 2021, 22:37
Location: Oss, Netherlands

Re: Repeated failed forced regens - limp mode

Post by abarthmultijet » 29 Nov 2021, 21:54

s130 wrote:
29 Nov 2021, 14:27
While you are waiting for the plugs to arrive soak the old ones around the base/thread area with penetrating fluid. Go gently when removing as too much force will sheer the tops off! If tight then try a fixed wrench and repeatedly tap / shock / jiggle.
Exactly, make sure you don't cross thread the new plugs, the aluminium head is soft and the threads are easily damaged. If the plugs are really stuck try to get them loose them with a hot engine.
Abarth Punto Evo, Fiat Doblo 263 1.4 t-jet, Audi S4 B8.5, 1.3 Multijet specialist, Uconnect 7 specialist,

Sheffy
Posts: 7
Joined: 26 Nov 2021, 10:31

Re: Repeated failed forced regens - limp mode

Post by Sheffy » 09 Dec 2021, 23:42

So replaced glow plugs and no fault codes remain. No coil light now and no EML light. However the car is still in limp mode. :cry:

Tried to do a regen on multiecuscan and it failed again. It states generic error in the status. "injected quantities outside permitted range". DPF pressure is reading 14mbar at idle, 88+ at 3500rpm. Sound too high?

Has anyone got any ideas why it's in limp mode with no fault codes and also why the DPF regens keep failing?

Thanks

abarthmultijet
Posts: 116
Joined: 17 Feb 2021, 22:37
Location: Oss, Netherlands

Re: Repeated failed forced regens - limp mode

Post by abarthmultijet » 10 Dec 2021, 21:41

Did you make sure the following conditions are right?:

- engine temperature >70 degrees celcius (90 degrees best)
- Vehicle stationary and handbrake on
- clutch and brake pedal released
- Engine idling (850rpm +/-50rpm)
Abarth Punto Evo, Fiat Doblo 263 1.4 t-jet, Audi S4 B8.5, 1.3 Multijet specialist, Uconnect 7 specialist,

Sheffy
Posts: 7
Joined: 26 Nov 2021, 10:31

Re: Repeated failed forced regens - limp mode

Post by Sheffy » 11 Dec 2021, 14:34

Yes the car was meeting the requirements to start the procedure and it does start the dpf regen without issue.

It initially revs up to 2000rpm and then once the EGTs are up it then revs to 3500. Once the EGTs reach 400°c, the car starts to vibrate/rumble slightly and the differential pressure climbs from 80mBar to 150+ and then the regen fails. It shows 0.00% completion, "generic error" in the state and a box comes up which says "injected quantities outside permitted range".

My mechanic has just drilled a hole through the DPF and we will try a forced regen again soon.

We are running out of ideas.

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